Mailinglist Archive: opensuse-programming (13 mails)

[Boyd Lynn Gerber <gerberb@xxxxxxxxx>]

Hi attached are two files that I am using to get one channel open.  Now I 
need a second.  I hate that I can not seem to remember enough C to do it.

Any assistence would be greatly appreciated.

Thanks in advance.

--
Boyd Gerber <gerberb@xxxxxxxxx> 801 849-0213
ZENEZ   1042 East Fort Union #135, Midvale Utah  84047/* sysV IPC message passing - receiver 

   recvmsg_sysV.c

    

    meant to work with sendmsg_sysV:

      start recvmsg_sysV in background,

      then start sendmsg_sysV

    */

    

    #include <stdlib.h>

    #include <stdio.h>

    #include <string.h>

    #include <sys/types.h>

    #include <sys/ipc.h>

    #include <sys/msg.h>

    

    struct my_msg_st {

      long int my_msg_type;

      char some_text[BUFSIZ];

    };

    

    int main() {

      int run = 1;

      struct my_msg_st some_data;

      int msqid;

      long int msg_to_recv = 1;

      

      msqid = msgget( (key_t)1234, 0666 | IPC_CREAT);

      if (msqid == -1) {

        perror("msgget in recvmsg_sysV failed");

        exit(EXIT_FAILURE);

      }

      

      while (run) {

        if (msgrcv(msqid, &some_data, BUFSIZ, msg_to_recv, 0) == -1) {

          perror("msgrcv in recvmsg_sysV failed");

          exit(EXIT_FAILURE);

        }

        printf("You wrote: %s", some_data.some_text);    

        if (strncmp(some_data.some_text, "end", 3) == 0) {

          run = 0;

        }  

      }

      

      if (msgctl(msqid, IPC_RMID, 0) == -1) {

        perror("msgctl in recvmsg_sysV failed");

        exit(EXIT_FAILURE);

      }

      

      exit(EXIT_SUCCESS);

    }

/* sysV IPC message passing - sender 

   sendmsg_sysV.c

    

    meant to work with recvmsg_sysV:

      start rcvmesg_sysV in background,

      then start sendmsg_sysV

    */

    

    #include <stdlib.h>

    #include <stdio.h>

    #include <string.h>

    #include <sys/types.h>

    #include <sys/ipc.h>

    #include <sys/msg.h>

    

    #define BUF 1024

    

    struct my_msg_st {

      long int my_msg_type;

      char some_text[BUFSIZ];

    };

    

    int main() {

      int run = 1;

      struct my_msg_st some_data;

      int msqid;

      char buffer[BUF];

      

      msqid = msgget( (key_t)1234, 0666 | IPC_CREAT);

      if (msqid == -1) {

        perror("msgget in sendmsg_sysV failed");

        exit(EXIT_FAILURE);

      }

      

      while (run) {

        printf("Enter some text:");

        fgets(buffer, BUF, stdin);

        some_data.my_msg_type = 1;

        strcpy(some_data.some_text, buffer);

        

        if (msgsnd(msqid, &some_data, BUF, 0) == -1) {

          perror("msgsnd in sendmsg_sysV failed");

          exit(EXIT_FAILURE);

        }

        

        if (strncmp(buffer, "end", 3) == 0) {

          run = 0;

        }

      }

      

      exit(EXIT_SUCCESS);

    }